adds spoiler

modules/qualifying/learning_systemd_login.md

@@ -273,7 +273,6 @@ Try to have a go a creating one from scratch!
 <details>
   <summary>Spoiler warning</summary>
 
-
 ```
 ➜  ~ cat site-manager.sh 
 #!/bin/bash
@@ -309,6 +308,7 @@ esac
 
 </details>
 
+
 If we try out this script, as `sudo` because we need to modify files owned by other users, we get the following.
 It's a proof of concept but more than enough to continue with the service files.